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Prevent corrupted recording when recording is interrupted.

Bret requested to merge (removed):patch-1 into dev

It's very annoying to get partial video because the process died or was shutdown uncleanly. This fixes the issue. Here is an explanation of the options set:

Normally, a MOV/MP4 file has all the metadata about all packets stored in one location (written at the end of the file.

faststart: Will move the metadata to the beginning of the file after the recording is complete.

frag_keyframe: Starts a new fragment at each video keyframe. This allows a file to work, even if the metadata isn't written at the end or beginning of the file, since it encodes with each keyframe. (Tested with kill -9 on and start/stop recording where the end metata data wasn't written)

empty_moov: will cause output to be 100% fragmented; without this the first fragment will be muxed as a short movie (using moov) followed by the rest of the media in fragments.

Edited by Moe

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